Domanda del libro di testo
How do pacemaker cardiac muscle cells differ from contractile cardiac muscle cells? What is autorhythmicity?
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Ch. 17 The Cardiovascular System I: The Heart
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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TOC.tableOfContents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
Capitolo 17, Problema 8a
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The rapid depolarization phase of the contractile cell action potential is due to the opening of voltage-gated potassium ion channels.
Guida verificata passo dopo passo1
Step 1: Begin by understanding the phases of the contractile cell action potential. The contractile cells in the heart undergo a specific sequence of electrical changes during an action potential: rapid depolarization, initial repolarization, plateau phase, and final repolarization.
Step 2: Focus on the rapid depolarization phase. This phase is characterized by a sudden and significant increase in the membrane potential, which is primarily caused by the influx of ions through specific channels.
Step 3: Recall the role of ion channels during depolarization. The rapid depolarization phase is due to the opening of voltage-gated sodium ion (Na⁺) channels, not potassium ion (K⁺) channels. Sodium ions rush into the cell, causing the membrane potential to become more positive.
Step 4: Evaluate the statement provided in the problem. The statement claims that the rapid depolarization phase is due to the opening of voltage-gated potassium ion channels. This is false because potassium ion channels are primarily involved in repolarization phases, not depolarization.
Step 5: Correct the false statement to make it true. The corrected statement should read: 'The rapid depolarization phase of the contractile cell action potential is due to the opening of voltage-gated sodium ion channels.'
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Action Potential
An action potential is a rapid change in membrane potential that occurs in excitable cells, such as neurons and muscle cells. It involves a sequence of depolarization and repolarization phases, which are essential for the transmission of electrical signals. Understanding the phases of action potential is crucial for analyzing cardiac and neural function.
Video consigliato:
03:53
Action Potential
Depolarization
Depolarization refers to the process where the membrane potential becomes less negative (or more positive) due to the influx of positively charged ions, primarily sodium (Na+). In contractile cardiac cells, this phase is primarily driven by the opening of voltage-gated sodium channels, leading to a rapid increase in membrane potential, which is essential for muscle contraction.
Video consigliato:
3:49Cardiac Action Potentials Example 1
Voltage-Gated Ion Channels
Voltage-gated ion channels are specialized proteins in the cell membrane that open or close in response to changes in membrane potential. These channels are critical for the generation and propagation of action potentials. In the context of cardiac action potentials, the opening of sodium channels during depolarization and potassium channels during repolarization plays a key role in the electrical activity of the heart.
Video consigliato:
01:55Ions - Sodium and Potassium Example 3
Pratica correlata
Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Pacemaker cells lack a distinct plateau phase.
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Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Open sodium ion channels cause hyperpolarization in pacemaker cells, which triggers HCN channels to open and begins a new action potential.
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Domanda del libro di testo
Mr. Watson has been diagnosed with mitral insufficiency, or a malfunctioning mitral valve, which causes the valve to not close properly. Predict the signs and symptoms you might expect from a disease of this valve. What would happen to the patient's stroke volume and cardiac output? Explain. What might help improve his cardiac output?
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Domanda del libro di testo
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The plateau phase in contractile cells is due to the influx of calcium ions through calcium ion channels.
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Domanda del libro di testo
Cardiac muscle cells are joined by structures called:
a. T-tubules.
b. tight junctions.
c. sarcoplasmic reticulum.
d. intercalated discs.
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